<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
     .box{
         width: 200px;
         height: 200px;
         background-color: pink;
     }
    </style>
</head>
<body>
    <div class="box"></div>
    <script>
        var box=document.querySelector('.box')
        box.addEventListener('click',function(e){
          var x=e.pageX-this.offsetLeft;
          var y= e.pageY-this.offsetTop;
          console.log(x);
          console.log(y);
          
        })
    </script>
</body>
</html>